(19)

(11)

EP 0 970 138 A1

(12)

(43) Date of publication: 12.01.2000 Bulletin 2000/02 (21) Application number: 98920496.1 (22) Date of filing: 23.03.1998

(51) International Patent Classification (IPC)7: C08G 67/02 (86) International application number: PCT/EP9801/896 (87) International publication number: WO 9842/770 (01.10.1998 Gazette 1998/39)

(84) Designated Contracting States: AT CH DE DK FI FR GB IE IT LI NL SE (30) Priority: 24.03.1997 EP 97200868 12.11.1997 EP 97309094 (71) Applicant: SHELL INTERNATIONALE RESEARCHMAATSCHAPPIJ B.V. 2596 HR Den Haag (NL)	(72) Inventors: BROEKHUIS, Antonius, Augustinus NL-1031 CM Amsterdam (NL) FRERIKS, Jan NL-1031 CM Amsterdam (NL) WONG, Pui, Kwan Houston, TX 77005 (US)